Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter

Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter

Overview

The Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter lets you connect Thunderbolt and Thunderbolt 2 devices — such as external hard drives and Thunderbolt docks — to any of the Thunderbolt 3 (USB-C) ports on your MacBook Pro.

As a bidirectional adapter, it can also connect new Thunderbolt 3 devices to a Mac with a Thunderbolt or Thunderbolt 2 port and macOS Sierra.

In addition, it can be used to connect Thunderbolt-enabled displays — such as the Apple Thunderbolt Display and LG Thunderbolt 2 displays — to any of the Thunderbolt 3 (USB-C) ports on your MacBook Pro. However, using this adapter with an Apple Thunderbolt Display requires a power source, because the display does not provide power through the adapter.

Note: This adapter does not support DisplayPort displays like the Apple LED Cinema Display or third-party DisplayPort and Mini DisplayPort displays. For more information, visit the Apple Support page for the Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter.

Answer

If you mean the CJ79, then I think so.
Thunderbolt 2 supports DisplayPort 1.2. Thunderbolt 3 supp
If you mean the CJ79, then I think so.
Thunderbolt 2 supports DisplayPort 1.2. Thunderbolt 3 supports two DisplayPort signals but I think only one is used for 3440x1440@100Hz (30bit color) = 14.9 Gbps so Thunderbolt 2 should be sufficient and there should be remaining bandwidth available for the USB 2.0 ports.
Only the Apple Thunderbolt 3 to Thunderbolt 2 adapter allows connecting Thunderbolt 3 devices to Thunderbolt 2 computers so this is the adapter you need.

Answer

The Sabrent EC-NVME is a USB 3.1 gen 2 device so the max speed you could expect is a little over 900
The Sabrent EC-NVME is a USB 3.1 gen 2 device so the max speed you could expect is a little over 900 MB/s which is a good portion of the theoretical limit of USB 3.1 gen 2 (9.7 Gbps considering the encoding overhead of 128b/132b but not the overhead of the USB protocol).
The best (only?) way to add USB 3.1 gen 2 to a Mac that only has Thunderbolt 2 is to connect a Thunderbolt 3 device that has two Thunderbolt 3 ports using an Apple Thunderbolt 3 to Thunderbolt 2 adapter. The second Thunderbolt 3 port of the Thunderbolt 3 device can be used for USB 3.1 gen 2 devices.
Some Thunderbolt 3 docks also have other USB 3.1 gen 2 USB-C ports. If they are based on the ASMedia ASM1142 (8 Gbps PCIe 2.0x2 or 7.9 Gbps PCIe 3.0x1), then you'll get slightly better performance using a Thunderbolt 3 port. I think they all use the ASM1142 because it only requires one PCIe 3.0 lane from the Thunderbolt 3 controller leaving three lanes for other controllers (usually two USB 3.0 controllers and one Ethernet controller but sometimes a FireWire or eSATA controller).
Check the Wire Cutter review "The Best Thunderbolt 3 Docks" for more info.

Answer

No, the iPad Pro 2018 does not have a Thunderbolt 3 port. You cannot connect a Thunderbolt dock to a
No, the iPad Pro 2018 does not have a Thunderbolt 3 port. You cannot connect a Thunderbolt dock to a USB-C port that does not support Thunderbolt unless the Thunderbolt dock uses the new Titan Ridge Thunderbolt 3 controller. The Belkin Thunderbolt 2 Dock uses an old Falcon Ridge Thunderbolt 2 controller.
The USB-C port of the iPad Pro 2018 supports USB 3.1 gen 2 and DisplayPort 1.4 but not Thunderbolt, so you will want to find a USB-C dock that supports USB 3.1 gen 2 and DisplayPort 1.4.
The HP Thunderbolt Dock G2 can be connected to either a Thunderbolt 3 port or a USB-C port because it uses the new Titan Ridge Thunderbolt 3 controller. You'll need to add a DisplayPort to HDMI 2.0 adapter for your display, and a Thunderbolt 3 to Thunderbolt 2 adapter for your MacBook Pro 2013.
Most Thunderbolt 3 docks use the older Alpine Ridge Thunderbolt 3 controller which cannot be connected to a USB-C port that does not support Thunderbolt. If the dock supports DisplayPort 1.4, then you can be sure that it uses the Titan Ridge Thunderbolt 3 controller.
You could settle for a USB-C dock that supports USB 3.0 and DisplayPort 1.2 or HDMI. You can connect a USB-C dock to a Thunderbolt 2 Mac using a Thunderbolt 3 device or dock that has two Thunderbolt 3 ports - the USB-C dock would connect to the second Thunderbolt 3 port of the Thunderbolt 3 device.